Buffett’s cancer was among the first round of questions fielded Saturday morning at Berkshire’s annual shareholders meeting. The 81-year-old Buffett announced last month he had stage one prostate cancer, and will begin treatment in July. He told shareholders that he has four doctors, who’ve told him he won’t need to be hospitalized or take a day off work.

Among the topics Buffett discussed was the European banking crisis. He characterized the American banking system as being in “fine shape,” but says European banks are struggling.

Berkshire Hathaway’s net income doubled in the first quarter of 2012, to $3.25 billion.